公开(公告)号：US20170317387A1

公开(公告)日：2017-11-02

申请号：US15521263

申请日：2015-10-19

Applicant: NEC Corporation

Inventor： Kazuhiko INOUE ,  Kenichi SHIMURA ,  Noboru YOSHIDA

IPC: H01M10/0569 ,  H01M10/0567 ,  H01M2/16 ,  H01M10/0585 ,  H01M10/0565

Abstract: Provided is a secondary battery which uses a heat generating reaction of the redox shuttle agent to achieve stopping a function of fee battery by blocking ion conduction and rapidly increasing an internal resistance by means of volatilized non-aqueous solvent when an abnormality such as overcharge occurs. A secondary battery 1 comprises a battery element comprising a positive electrode 11, a negative electrode 12, a separator 13, and an electrolytic solution, and a casing sealing the battery element. The electrolytic solution comprises a redox shuttle agent and an organic solvent having a boiling point of 125° C. or less. The separator 13 comprises aramid fiber assembly, aramid microporous structure, polyimide microporous structure or polyphenylenesulfide microporous structure, and polyphenylenesulfide, and has an average void size of 0.1 μm or more.

公开(公告)号：US20180115015A1

公开(公告)日：2018-04-26

申请号：US15560833

申请日：2016-03-24

Applicant: NEC Corporation

Inventor： Kazuhiko INOUE ,  Kenichi SHIMURA ,  Daisuke KAWASAKI ,  Noboru YOSHIDA

IPC: H01M10/0525 ,  H01M4/587 ,  H01M4/38 ,  H01M4/36 ,  H01M4/48 ,  H01M2/16 ,  B60L11/18

CPC classification number: H01M10/0525 ,  B60L50/64 ,  H01M2/16 ,  H01M2/1653 ,  H01M4/131 ,  H01M4/133 ,  H01M4/134 ,  H01M4/364 ,  H01M4/38 ,  H01M4/386 ,  H01M4/48 ,  H01M4/483 ,  H01M4/587 ,  H01M10/058 ,  H01M2004/027 ,  H01M2220/20 ,  Y02T10/7011

Abstract: Provided is a lithium ion secondary battery with high safety and high energy density which solves a concern about the safety, when a large amount of metal is used in a negative electrode active materials to achieve higher energy density and therefore an acceptable amount of lithium in a carbon material of the negative electrode is smaller than a releasable amount of lithium in a positive electrode active material. The present invention relates to a lithium ion secondary battery, wherein the positive electrode has a charge capacity per unit area of 3 mAh/cm2 or more, the negative electrode comprises a metal and/or a metal oxide and a carbon as negative electrode active materials, the acceptable amount of lithium in the carbon in the negative electrode is less than the releasable amount of lithium from the positive electrode, and the separator has a thermal shrinkage coefficient of less than 3% at a boiling point of the electrolyte solution in the electrolyte solution.

公开(公告)号：US20180026256A1

公开(公告)日：2018-01-25

申请号：US15550668

申请日：2016-02-09

Applicant: NEC Corporation

Inventor： Kazuhiko INOUE ,  Kenichi SHIMURA

IPC: H01M2/34 ,  H01M10/058 ,  H01M10/0525

CPC classification number: H01M2/348 ,  H01M2/1022 ,  H01M2/1061 ,  H01M2/1072 ,  H01M2/20 ,  H01M2/30 ,  H01M2/345 ,  H01M10/052 ,  H01M10/0525 ,  H01M10/058 ,  H01M2200/10 ,  H01M2200/20 ,  H01M2220/20 ,  Y02E60/122

Abstract: Provided is a battery capable of surely interrupting current at the time of temperature rise so that excessive heat generation does not occur at the occurrence of an abnormality. The battery 1 includes a battery element 10 including a positive electrode and a negative electrode, an inner package 13 which forms a first chamber 13a for enclosing the battery element 10, an outer package 14 which encloses the inner package 13 such that the outer package 14 forms a second chamber 14a which surrounds the first chamber 13a, and a pair of terminals 11, 12 electrically connected to the positive electrode and the negative electrode and led out to the outside of the outer package 14. One terminal 11 of the pair of terminals 11, 12 has a first terminal 11a and a second terminal 11b arranged so as to be electrically connected in the second chamber 13a. A gas generating material 14 which generates gas at a predetermined temperature or higher or a predetermined voltage or higher is enclosed in the first chamber 13a or the second chamber 14a.

公开(公告)号：US20150340679A1

公开(公告)日：2015-11-26

申请号：US14650402

申请日：2013-11-12

Applicant: NEC CORPORATION

Inventor： Kenichi SHIMURA ,  Kazuhiko INOUE

IPC: H01M2/16 ,  H01M10/0525 ,  H01M2/14

CPC classification number: H01M2/145 ,  H01G11/52 ,  H01M2/1613 ,  H01M2/1673 ,  H01M2/1686 ,  H01M10/052 ,  H01M10/0525 ,  Y02E60/13 ,  Y02T10/7022 ,  Y10T156/10

Abstract: The present invention provides a separator drastically reducing the short-circuit between electrodes and having satisfactory ionic conductivity on the basis of the use of inorganic materials. The separator 23 has a substrate 23a including a layer formed by using an inorganic material so as to have a plurality of openings, and an inorganic fiber layer 23b laminated on one surface or both surfaces of the substrate 23a so as to cover the openings of the substrate 23a without blocking the openings of the substrate 23a. The thickness of the separator 23 is 100 μm or less.

Abstract translation: 本发明提供了一种分离器，其基于无机材料的使用，大大降低了电极之间的短路并且具有令人满意的离子导电性。 隔板23具有包括通过使用无机材料形成为具有多个开口的层的基板23a和层叠在基板23a的一个表面或两个表面上的无机纤维层23b，以覆盖基板23a的开口 衬底23a而不阻挡衬底23a的开口。 隔板23的厚度为100μm以下。

公开(公告)号：US20210028485A1

公开(公告)日：2021-01-28

申请号：US16980479

申请日：2019-03-20

Applicant: NEC CORPORATION

Inventor： Kazuhiko INOUE ,  Kenichi SHIMURA

IPC: H01M10/0525 ,  H01M10/0569 ,  H01M4/36 ,  H01M4/62 ,  H01M2/16 ,  H01M10/0567

Abstract: An object of one embodiment of the present invention is to provide a lithium-ion secondary battery with high safety in which deterioration of a separator comprising polyethylene terephthalate is suppressed even when an electrolyte solution comprising a carbonate-based solvent is used. A first lithium ion secondary battery of the present invention is a lithium ion secondary battery comprising an electrode laminate comprising a positive electrode, a negative electrode and a separator, and an electrolyte solution, wherein the negative electrode comprises a solution type binder, the separator comprises polyethylene terephthalate, and the electrolyte solution comprises a solvent comprising a compound having a carbonate group.

公开(公告)号：US20200220119A1

公开(公告)日：2020-07-09

申请号：US16645005

申请日：2018-09-27

Applicant: NEC CORPORATION

Inventor： Noboru YOSHIDA ,  Kazuhiko INOUE ,  Kenichi SHIMURA ,  Makihiro OTOHATA

IPC: H01M2/02 ,  H01M2/08 ,  H01M10/04

Abstract: A battery having a battery element with an outer package made of a film that includes a first portion having a first bottom wall and a first side wall rising from an outer peripheral end of the first bottom wall over an entire outer peripheral end of the first bottom wall, a second portion having a second bottom wall and a second sidewall rising from an outer peripheral end at least at a part of the outer peripheral end of the second bottom surface, and a joining portion in which outer peripheral portions of the first and second portions are joined when the battery element is between the first and second bottom walls and the first and second portions face each other, wherein the joining portion includes a sidewall joining portion in which the first and second sidewalls are joined and located outside a thickness range of the battery element.

公开(公告)号：US20180159105A1

公开(公告)日：2018-06-07

申请号：US15572569

申请日：2016-05-09

Applicant: NEC CORPORATION

Inventor： Jiro IRIYAMA ,  Kazuhiko INOUE ,  Kenichi SHIMURA

IPC: H01M2/16 ,  H01M10/0525 ,  H01M4/525 ,  H01M4/505 ,  H01M10/0585

CPC classification number: H01M2/1653 ,  H01M4/505 ,  H01M4/525 ,  H01M10/0525 ,  H01M10/058 ,  H01M10/0585 ,  H01M2220/20 ,  Y02E60/122 ,  Y02P70/54 ,  Y02T10/7011

Abstract: There is provided a lithium ion secondary battery having a positive electrode comprising a lithium nickel composite oxide as a positive electrode active material, and a separator consisting of one or more layers selected from a polyimide layer, a polyamide layer, and a polyamide imide layer, the lithium secondary battery exhibiting a low self-discharge failure rate even after long term storage. The present invention pertains to a lithium ion secondary battery having a positive electrode comprising a positive electrode active material comprising a lithium nickel composite oxide and a separator consisting of one or more layers selected from a polyimide layer, a polyamide layer, and a polyamide imide layer, wherein a suspension prepared by mixing the positive electrode active material and a deionized water at a mass ratio of 2:98 shows a pH of 9.3 or less.

公开(公告)号：US20180090792A1

公开(公告)日：2018-03-29

申请号：US15560639

申请日：2016-03-22

Applicant: NEC CORPORATION

Inventor： Daisuke KAWASAKI ,  Kenichi SHIMURA ,  Noboru YOSHIDA ,  Kazuhiko INOUE ,  Jiro IRIYAMA

IPC: H01M10/0585 ,  H01M10/0525 ,  H01M10/0569 ,  H01M4/131 ,  H01M4/485 ,  H01M4/505 ,  H01M4/525 ,  H01M4/04 ,  H01M10/04

CPC classification number: H01M10/0585 ,  H01M2/16 ,  H01M4/0404 ,  H01M4/131 ,  H01M4/485 ,  H01M4/505 ,  H01M4/525 ,  H01M10/0413 ,  H01M10/0525 ,  H01M10/0569 ,  H01M2004/021 ,  H01M2220/20 ,  H01M2300/0028 ,  Y02P70/54 ,  Y02T10/7011

Abstract: The present invention relates to a lithium ion secondary battery comprising a positive electrode having a coating amount per unit area of 50 mg/cm2 or more and an electrode density of 3.3 g/cc or more and a negative electrode having a coating amount per unit area of 24 mg/cm2 or more and an electrode density of 1.5 g/cc or more, a separator having a shrinking ratio of 2% or less by heat treatment at 80° C. for 6 hours, and an electrolyte solution comprising at least one sulfonic acid ester compound, and a ratio of a sulfur content in the central portion (As) and a sulfur content in the edge portion (Bs) of the positive electrode and the negative electrode, in each, is 0.7≦As/Bs≦1.1.

公开(公告)号：US20170358829A1

公开(公告)日：2017-12-14

申请号：US15521242

申请日：2015-10-19

Applicant: NEC Corporation

Inventor： Kazuhiko INOUE ,  Kenichi SHIMURA

IPC: H01M10/42 ,  H01M2/16 ,  H01M10/0565 ,  H01M10/0568 ,  H01M2/34 ,  H01M10/0569

CPC classification number: H01M10/4235 ,  H01M2/145 ,  H01M2/162 ,  H01M2/1653 ,  H01M2/345 ,  H01M10/052 ,  H01M10/0565 ,  H01M10/0568 ,  H01M10/0569 ,  H01M10/0585 ,  H01M2200/20 ,  H01M2300/0085 ,  Y02P70/54 ,  Y02T10/7011

Abstract: Provided is a secondary battery capable of breaking an external electrical connection by way of a simpler configuration when an abnormality such as overcharge occurs. A secondary battery 1 comprises a battery element comprising a positive electrode 11, a negative electrode 12, a separator 13, and an electrolytic solution, and a casing sealing the battery element. The electrolytic solution comprises a gel component and an organic solvent having a boiling point of 125° C. or less. The separator 13 comprises a fiber assembly or a microporous structure composed of one or more resins selected from aramid, polyimide, and polyphenylenesulfide, and has an average void size of 0.1 μm or more.

公开(公告)号：US20210091359A1

公开(公告)日：2021-03-25

申请号：US16630256

申请日：2018-05-29

Applicant: NEC CORPORATION

Inventor： Kenichi SHIMURA

IPC: H01M2/18 ,  H01M2/16 ,  H01M2/14 ,  H01M10/0525

Abstract: The present invention provides a bag-shaped separator made of a separator material containing a material having the softening or melting point with a thermally bonded portion less susceptible to breakage, a thermal bonding method and a thermal bonding device therefor, and an electric storage device. The bag-shaped separator is formed with two sheets of a separator material with piled or a one sheet of the separator material with folded and piled. The separator material includes a polymer material having a melting or softening point and has one or more thermal bonding regions 30 at the edge of piled separator materials. The thermal bonding region 30 includes a fused region 31 where the separator material solidifies again after melting or softening, and a region 32 where the fusion rate of the polymer material decreases continuously from the fused region 31 toward a region 34 adjacent to the thermal bonding region 30.